Relevant bibliographies by topics / Helium hydrogen atmospheres

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  2. Dissertations / Theses
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Academic literature on the topic 'Helium hydrogen atmospheres'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 July 2025

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Journal articles on the topic "Helium hydrogen atmospheres"

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Liebert, James. "Abundance Patterns in White Dwarfs." Symposium - International Astronomical Union 145 (1991): 411–19. http://dx.doi.org/10.1017/s007418090022754x.

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Various evidence indicates that the atmospheric compositions of white dwarfs may switch from hydrogen- to helium- dominated, and vice versa, over wide ranges of surface temperature (luminosity). This envelope evolution may be understood only by assuming that the hydrogen (DA) sequence retains only a tiny residual mass of hydrogen, many orders of magnitude less than that predicted by stellar evolution theory. A corresponding problem may exist for the helium envelopes of some lot stars with helium-rich atmospheres.
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Cherubim, Collin, Robin Wordsworth, Renyu Hu, and Evgenya Shkolnik. "Strong Fractionation of Deuterium and Helium in Sub-Neptune Atmospheres along the Radius Valley." Astrophysical Journal 967, no. 2 (2024): 139. http://dx.doi.org/10.3847/1538-4357/ad3e77.

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Abstract We simulate atmospheric fractionation in escaping planetary atmospheres using IsoFATE, a new open-source numerical model. We expand the parameter space studied previously to planets with tenuous atmospheres that exhibit the greatest helium and deuterium enhancement. We simulate the effects of extreme-ultraviolet-driven photoevaporation and core-powered mass loss on deuterium–hydrogen and helium–hydrogen fractionation of sub-Neptune atmospheres around G, K, and M stars. Our simulations predict prominent populations of deuterium- and helium-enhanced planets along the upper edge of the r
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Salmi, Tuomo, Serena Vinciguerra, Devarshi Choudhury, et al. "Atmospheric Effects on Neutron Star Parameter Constraints with NICER." Astrophysical Journal 956, no. 2 (2023): 138. http://dx.doi.org/10.3847/1538-4357/acf49d.

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Abstract We present an analysis of the effects of uncertainties in the atmosphere models on the radius, mass, and other neutron star parameter constraints for the NICER observations of rotation-powered millisecond pulsars. To date, NICER has applied the X-ray pulse profile modeling technique to two millisecond-period pulsars: PSR J0030+0451 and the high-mass pulsar PSR J0740+6620. These studies have commonly assumed a deep-heated, fully ionized hydrogen atmosphere model, although they have explored the effects of partial ionization and helium composition in some cases. Here, we extend that exp
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Tian, Meng, and Kevin Heng. "Atmospheric Chemistry of Secondary and Hybrid Atmospheres of Super Earths and Sub-Neptunes." Astrophysical Journal 963, no. 2 (2024): 157. http://dx.doi.org/10.3847/1538-4357/ad217c.

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Abstract The atmospheres of small exoplanets likely derive from a combination of geochemical outgassing and primordial gases left over from formation. Secondary atmospheres, such as those of Earth, Mars, and Venus, are sourced by outgassing. Persistent outgassing into long-lived, primordial, hydrogen–helium envelopes produces hybrid atmospheres of which there are no examples in the solar system. We construct a unified theoretical framework for calculating the outgassing chemistry of both secondary and hybrid atmospheres, where the input parameters are the surface pressure, oxidation, and sulfi
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Heber, U., K. Hunger, T. Rauch, and K. Werner. "Improved Non-LTE Model Atmospheres for Subluminous O-Stars." Symposium - International Astronomical Union 132 (1988): 117–22. http://dx.doi.org/10.1017/s0074180900034872.

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Improved non-LTE model atmospheres designed for the analysis of very hot subluminous O stars are presented. The calculations are based on the new method of the accelerated lambda iteration (ALI) which proves capable of treating up to 100 levels of various ions. Presented here are improved calculations for (i) pure hydrogen model atmospheres including Stark broadening, (ii) for hydrogen- and helium-composed model atmospheres and (iii) first preliminary models which include in addition a detailed carbon model atom. These models remove an apparent mismatch of Balmer line profiles noted previously
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Radmilović-Radjenović, Marija, Martin Sabo, and Branislav Radjenović. "Transport Characteristics of the Electrification and Lightning of the Gas Mixture Representing the Atmospheres of the Solar System Planets." Atmosphere 12, no. 4 (2021): 438. http://dx.doi.org/10.3390/atmos12040438.

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Electrification represents a fundamental process in planetary atmospheres, widespread in the Solar System. The atmospheres of the terrestrial planets (Venus, Earth, and Mars) range from thin to thick are rich in heavier gases and gaseous compounds, such as carbon dioxide, nitrogen, oxygen, argon, sodium, sulfur dioxide, and carbon monoxide. The Jovian planets (Jupiter, Saturn, Uranus, and Neptune) have thick atmospheres mainly composed of hydrogen and helium involving. The electrical discharge processes occur in the planetary atmospheres leading to potential hazards due to arcing on landers an
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Allart, R., V. Bourrier, C. Lovis, et al. "Spectrally resolved helium absorption from the extended atmosphere of a warm Neptune-mass exoplanet." Science 362, no. 6421 (2018): 1384–87. http://dx.doi.org/10.1126/science.aat5879.

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Stellar heating causes atmospheres of close-in exoplanets to expand and escape. These extended atmospheres are difficult to observe because their main spectral signature—neutral hydrogen at ultraviolet wavelengths—is strongly absorbed by interstellar medium. We report the detection of the near-infrared triplet of neutral helium in the transiting warm Neptune-mass exoplanet HAT-P-11b by using ground-based, high-resolution observations. The helium feature is repeatable over two independent transits, with an average absorption depth of 1.08 ± 0.05%. Interpreting absorption spectra with three-dime
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Liebert, James. "The Origin and Evolution of Helium-Rich White Dwarfs." International Astronomical Union Colloquium 87 (1985): 367–85. http://dx.doi.org/10.1017/s0252921100090965.

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AbstractWhite dwarfs with helium-rich atmospheres constitute about one fifth of the white dwarfs hotter than 12,000 K. They appear to have a mass distribution similar to the hydrogen atmosphere (DA) stars, and are similar in other properties. However, the temperature distribution exhibits a deficiency of DB/DO stars in the interval 25,000-45,000 K, which implies evolution in the dominant surface composition as the stars cool. The hottest group of transition DO white dwarfs are the pulsating objects of the PG1159 class. The central star of Kl-16 is a related object, as may be the newly discover
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Cunningham, Tim, Pier-Emmanuel Tremblay, Evan B. Bauer, et al. "Horizontal spreading of planetary debris accreted by white dwarfs." Monthly Notices of the Royal Astronomical Society 503, no. 2 (2021): 1646–67. http://dx.doi.org/10.1093/mnras/stab553.

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ABSTRACT White dwarfs with metal-polluted atmospheres have been studied widely in the context of the accretion of rocky debris from evolved planetary systems. One open question is the geometry of accretion and how material arrives and mixes in the white dwarf surface layers. Using the three-dimensional (3D) radiation hydrodynamics code co5bold, we present the first transport coefficients in degenerate star atmospheres that describe the advection–diffusion of a passive scalar across the surface plane. We couple newly derived horizontal diffusion coefficients with previously published vertical d
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Cukanovaite, E., P.-E. Tremblay, B. Freytag, et al. "Calibration of the mixing-length theory for structures of helium-dominated atmosphere white dwarfs." Monthly Notices of the Royal Astronomical Society 490, no. 1 (2019): 1010–25. http://dx.doi.org/10.1093/mnras/stz2656.

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ABSTRACT We perform a calibration of the mixing-length parameter at the bottom boundary of the convection zone for helium-dominated atmospheres of white dwarfs. This calibration is based on a grid of 3D DB (pure-helium) and DBA (helium-dominated with traces of hydrogen) model atmospheres computed with the co5bold radiation-hydrodynamics code, and a grid of 1D DB and DBA envelope structures. The 3D models span a parameter space of hydrogen-to-helium abundances in the range −10.0 ≤ log (H/He) ≤−2.0, surface gravities in the range 7.5 ≤ log g ≤ 9.0, and effective temperatures in the range 12 000
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Dissertations / Theses on the topic "Helium hydrogen atmospheres"

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Kononov, Ring Materials Science &amp Engineering Faculty of Science UNSW. "Carbothermal solid state reduction of manganese oxide and ores in different gas atmospheres." Publisher:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41459.

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The aim of the project was to establish rate and mechanisms of solid state reduction of manganese ores. The project studied carbothermal reduction of manganese oxide MnO, two Groote Eylandt (Australian) and Wessels (South African) manganese ores in hydrogen, helium and argon atmospheres at temperatures up to 1400C for MnO and 1200C for manganese ores. Experiments were conducted in the fixed bed reactor with on-line off-gas analysis. The major findings are as follows. ?? Rate and degree of reduction of MnO and ores increased with increasing temperature. ?? Reduction of MnO and manganese ores at
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Liu, Jingjing. "Generation and characterisation of cold atmospheric liquid-containing plasmas." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/7761.

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This thesis presents an experimental study of non-thermal atmospheric pressure gas plasmas in presence of liquid as an efficient source of transient and reactive species to initiate chemical reactions necessary for many important applications. Two types of liquid-containing plasmas are considered: discharges formed between a needle electrode and a liquid electrode, and plasma jets formed in a water vapour flow mixed in helium or argon gas. Two plasma modes (the pulsed and the continuous mode) are observed in the needle-to-liquid plasma. A comparative study of the needle-to-liquid plasma in the
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Girard, Fanny. "Analyse physico-chimique de milieux liquides d’intérêt biologique exposés à des plasmas froids produits à pression atmosphérique et température ambiante." Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3025/document.

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Les plasmas froids sont des gaz partiellement ionisés, très riches d’un point de vue physico-chimique. Cette propriété se retrouve dans des plasmas froids aujourd’hui générés à pression atmosphérique et température ambiante et a été mise à profit depuis une quinzaine d’années environ pour des applications biomédicales (hématologie, dermatologie, cancérologie, odontologie etc…). L’efficacité de ces plasmas froids dans le domaine de la médecine a été prouvée par de nombreuses études. Cependant, les phénomènes biologiques mis en jeu ne sont pas encore bien compris, et il primordial de savoir quel
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Chen, Tsung-Wen, and 陳宗彣. "Analysis of Reactive Oxygen Species in Helium-based Atmospheric Pressure Plasma Jet and Generation of Hydroxyl Radical and Hydrogen Peroxide in Bio-solution for Dental-Pulp-Stem-Cell Culture." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/53072353632227557342.

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碩士<br>國立交通大學<br>生醫工程研究所<br>104<br>Past study have pointed out that plasma can inhibit cell proliferation, promote stem cell differentiation, which bring out the possibility of plasma on tissue regeneration engineering applications. In addition, previous study showed that the reactive oxygen species (ROS) produced by cold plasma would influence the inter- and intracellular networks on mammalian cells. Other study indicates that latent transforming growth factor-β1 can be induced by ROS to direct dental stem cells differentiation and apply to stem cell therapy to induce dentin regeneration. In t
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Books on the topic "Helium hydrogen atmospheres"

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United States. National Aeronautics and Space Administration., ed. Theoretical studies of interstellar processes: Final report, December 1, 1991-February 28, 1995. Institute for Scientific Research, 1995.

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Book chapters on the topic "Helium hydrogen atmospheres"

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Odell, Andrew P., and Stephen A. Voels. "Helium-Rich Stellar Atmosphere Models for B Stars." In Hydrogen Deficient Stars and Related Objects. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4744-3_33.

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Hunger, K. "Intermediate Helium Stars: Atmospheric Parameters, Oblique Rotators and Shells." In Hydrogen Deficient Stars and Related Objects. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4744-3_31.

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Yung, Yuk L., and William B. DeMore. "Jovian Planets." In Photochemistry of Planetary Atmospheres. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195105018.003.0008.

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The four giant planets in the outer solar system, Jupiter, Saturn, Uranus, and Neptune, are a distinct group by themselves. The essential astronomical and atmospheric aspects of these planets are summarized in table 5.1. The significance of this group in the chemistry of the solar system is briefly pointed out in chapter 4. These planets are composed primarily of the lightest elements, hydrogen and helium, which were captured from the solar nebula during formation. The planets have rocky cores made of heavier elements. In the case of Jupiter and Saturn the mass of the gas greatly exceeds that
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Piantadosi, Claude A. "Air as Good as We Deserve." In The Biology of Human Survival. Oxford University PressNew York, NY, 2003. http://dx.doi.org/10.1093/oso/9780195165012.003.0012.

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Abstract The evolution of advanced forms of animal life on Earth would not have been possible without molecular oxygen (O2), but too much of it is toxic to virtually all cells and organisms. Oxygen is the third-most abundant element in the universe after hydrogen and helium. It is formed at the heart of stars by the fusion of helium with carbon. More than 90% of the known universe is made up of hydrogen, whereas the other four major molecular building blocks of life, oxygen, carbon, nitrogen, and phosphorus, collectively account for less than a quarter of 1% of its composition. The abundance o
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Lianlunthang, TD Peter, Rabindra Mahato, and Monmoyuri Baruah. "AXISYMMETRY AND DYNAMO MECHANISMS IN SATURN'S INTERNAL MAGNETIC FIELD: CHALLENGES, THEORIES, AND FUTURE PROSPECTS." In Futuristic Trends in Physical Sciences Volume 3 Book 2. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bkps2p1ch5.

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Saturn's magnetic field, characterized by its near-perfect axisymmetry of the dipole axis, presents a unique and enigmatic phenomenon not observed in other planets with active dynamos. The prevailing theoretical explanation for the high axisymmetry of Saturn's magnetic field is attributed to the downward separation of helium from hydrogen, as proposed by Stevenson. Numerous studies have supported Stevenson's theories, but there are also dissenting opinions. Further research is needed to have a deeper understanding of the mechanism of producing an axisymmetric internal magnetic field. Since acc
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Conference papers on the topic "Helium hydrogen atmospheres"

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Carroll, Alex T., Guillaume Blanquart, Aaron M. Brandis, and Brett A. Cruden. "Kinetic and Transport Modeling for Entry Flows in Hydrogen-Helium Atmospheres." In AIAA AVIATION 2023 Forum. American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-3728.

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Tošić, S., V. A. Srećković, and V. Vujčić. "Photodissociation processes in non-symmetric systems." In International Meeting on Data for Atomic and Molecular Processes in Plasmas: Advances in Standards and Modelling. Institute of Physics Belgrade, 2024. https://doi.org/10.69646/aob241117.

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New findings in the fields of atmospheric science, astrochemistry etc. have been made possible by recent experimental and theoretical developments. One of the most crucial processes in planetary atmospheres and interstellar media is photodissociation. A brief overview of the fundamental physical processes including photodissociation and photoionization of molecules of astronomical interest as well as new astrophysically relevant molecular species have recently been added to the Leiden VUV cross section database (Hrodmarsson and Dishoeck, 2023). The importance of these data for analyzing observ
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Lavrentieva, Nina N., Anna S. Dudaryonok, and Oleg S. Osipov. "Water vapor line broadening induced by hydrogen and helium pressure." In XXII International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, edited by Gennadii G. Matvienko and Oleg A. Romanovskii. SPIE, 2016. http://dx.doi.org/10.1117/12.2249314.

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Guo, Hongsheng, Fengshan Liu, and Gregory J. Smallwood. "A Numerical Study of the Influence of Hydrogen Addition on Soot Formation in a Laminar Counterflow Ethylene/Oxygen/Nitrogen Diffusion Flame." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59407.

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The influence of hydrogen addition to the fuel on soot formation in an ethylene/oxygen/nitrogen diffusion flame was numerically studied by simulation of three counterflow laminar diffusion flames at atmosphere pressure. The fuel mixtures for the three flames are pure ethylene, ethylene/hydrogen and ethylene/helium, respectively, while the oxidant is a mixture of oxygen and nitrogen. A detailed gas phase reaction mechanism including species up to benzene and complex thermal and transport properties were used. The soot inception and surface growth rates were, respectively, calculated based on be
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Chen, D., J. Colmenares-Angulo, R. Molz, C. Dambra, and D. Hawley. "Helium-Free Parameter Development for TriplexPro-210 Plasma Gun." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, et al. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0627.

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Abstract This paper focuses on the use of hydrogen and nitrogen as secondary gases for atmospheric plasma spray using the TriplexPro-210 gun platform. The paper includes process mapping of particle state in addition to measurements of actual stress states within the coating during coating application. The feedstock powders used for this investigation include yttria stabilized zirconia, chromium oxide, nickel chromium aluminum and nickel aluminum. In addition, the paper discusses differences in application costs.
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Dedov, E. O., A. E. Kostenkov, and A. S. Vinokurov. "Modeling Spectra of AF And in The Hot State." In 52-st All-Russian with international participation student scientific conference "Physics of Space". Ural University Press, 2025. https://doi.org/10.15826/b978-5-7996-3986-0.48.

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We present the results of radiative transfer modeling with non-LTE CMFGEN code of spectra of luminous blue variable AF And in M 31 galaxy. In order to approximate the observed emission lines intensities of hydrogen, neutral helium and numerous lines of nitrogen we created the spherically symmetric model of extended atmosphere with wind clumping effect taken into account. Here we discuss the problem of degeneracy of the reproducing the observed intensities of hydrogen lines relative to the parameters “hydrogen mass fraction-mass loss rate” and introduce stellar fundamental parameters estimates.
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Liu, Fengshan, Francesca Migliorini, Francesco Cignoli, Silvana De Iuliis, and Giorgio Zizak. "Effects of Hydrogen and Helium Addition to Fuel on Soot Formation in Axisymmetric Coflow Laminar Methane-Air Diffusion Flame." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32466.

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Numerical and experimental studies were conducted to investigate the effects of hydrogen and helium addition to fuel on soot formation in atmospheric axisymmetric coflow laminar methane-air diffusion flame. Soot temperature and volume fraction distributions were measured using a two-dimensional two-color technique. Numerically the conservation equations of mass, momentum, energy, and species in the limit of low-Mach number were solved. Detailed gas-phase chemistry and thermal and transport properties were accounted for. Radiative heat transfer by CO, CO2, H2O, and soot was calculated using the
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Yu, Qingfeng, and Quanke Feng. "Safety Design and Mock-Up Tests on the Combustion of Hydrogen-Air Mixture in the Vertical CNS Channel of the CARR-CNS." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89815.

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A two-phase thermo-siphon loop is applied to the Cold Neutron Source (CNS) of China Advanced Research Reactor (CARR). The moderator is liquid hydrogen. The two-phase thermo-siphon consists of the crescent-shape moderator cell, the moderator transfer tube, and the condenser. The hydrogen is supplied from the buffer tank to the condenser. The most characteristic point is that the cold helium gas is introduced into the helium sub-cooling system covering the moderator cell and then flows up through the tube covering the moderator transfer tube into the condenser. The helium sub-cooling system also
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Gupta, Sanjeev, Domenico Paladino, Pascal Benz, and Horst Michael Prasser. "Experimental Analysis of Containment Atmosphere Mixing and Stratification Induced by Vertical Fluid Release." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48502.

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Continuing safety assessments are important for the present and future generations of nuclear reactors to ensure safe and efficient use of nuclear energy. For safety analysis purpose, lumped parameter codes as well as codes with 3D capabilities are used to predict and simulate the containment conditions following a hypothetical accident. The assessment of code capability to predict consequences of hypothetical accidents can be done by comparing code simulations with experimental data obtained in large scale facilities under prototypical thermal hydraulic conditions. The large scale PANDA test
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Traparić, Ivan, Dragan Ranković, Biljana Stankov, Jelena Savović, Miroslav Kuzmanović, and Miloje Ivković. "OPTIMIZATION OF LASER-INDUCED PLASMA EMISSION FOR ELEMENTAL AND ISOTOPIC ANALYSIS OF HYDROGEN." In 17th International Conference on Fundamental and Applied Aspects of Physical Chemistry. Society of Physical Chemists of Serbia, 2024. https://doi.org/10.46793/phys.chem24i.049t.

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The LIBS technique based on the TEA CO2 laser is optimized for obtaining narrow and intense hydrogen Balmer lines, with the aim of application for quantitative and isotopic analysis of hydrogen. In the helium atmosphere under reduced pressure (below 10 mbar), for delay times longer than 5 μs, line widths of 0.04 nm were obtained, close to the instrumental width of the spectrograph. For optimal experimental conditions, plasma diagnostics were performed using optical emission spectroscopy methods: the electron concentration from 2.5 x 1021 m-3 to 2.7 x 1020 m-3, and gas temperature from 5000 to
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